How to Hide WP Comment Designer Lite Admin Menus

function plt_hide_wp_comment_designer_lite_menus() {
	//Hide "WP Comment Designer Lite".
	remove_menu_page('wp-comment-designer-lite');
	//Hide "WP Comment Designer Lite → WP Comment Designer Lite".
	remove_submenu_page('wp-comment-designer-lite', 'wp-comment-designer-lite');
	//Hide "WP Comment Designer Lite → Comment Form Builder".
	remove_submenu_page('wp-comment-designer-lite', 'wpcd-comment-form-builder');
	//Hide "WP Comment Designer Lite → How To Use".
	remove_submenu_page('wp-comment-designer-lite', 'wpcd-how-to-use');
	//Hide "WP Comment Designer Lite → More WordPress Stuff".
	remove_submenu_page('wp-comment-designer-lite', 'wpcd-about-us');
	//Hide "WP Comment Designer Lite → Documentation".
	remove_submenu_page('wp-comment-designer-lite', 'wpcd-documentation');
	//Hide "WP Comment Designer Lite → Check Premium Version".
	remove_submenu_page('wp-comment-designer-lite', 'wpcd-premium');
}

add_action('admin_menu', 'plt_hide_wp_comment_designer_lite_menus', 11);

Where do I put this code?